Yes, we had a similar problem with Mamou and the weight. He seemed fine, the vet didn't find a problem, but he just kept losing. He, too, was happy, and I fed him soft food; as much as he wanted, but he just kept losing. We lost him this past December. So, I know exactly what you mean.
Again, I'm so very sorry. I'm sure that you will always have a very special place in your heart for Beau. Meanwhile, you will miss him deeply, and the other cats probably will, too.
I thought, at first, that Uhura didn't miss Mamou overly much, but as the first month went by I noticed slight behavioral changes. For example, she stayed with me in his place more. And, she became *jumpy.* Dh didn't notice it at first, but I did. There was more, but the point is that in her own way, she was reacting to losing Mamou, and your cats may too, even if they seem indifferent at first.
(((Hug))) Beau is being met by many other beloved pets at the bridge.
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